Exam 4 Spring 2007Name_________________________Psych Stats Spring 2007 Brannick Exam 4Instructions: Write your name and U number on the scantron. For section, put 1 or 2 if you are in Dan’s lab; put 3 or 4 if you are in Xian’s lab. Answer any 50 of 55 questions on the exam by bubbling in the best of the four alternatives given. For those questions you wish to omit, bubble in “e.” If you answer all 55, I will choose the last 5 for you, so it is in your interest to pick 5 and bubble in “e”. You can take the printed exam with you.Handy formulas:NXX∑=; XsXXz-=A=(z*100)+500T=(z*10)+50z=(A-500)/100z=(T-50)/10A=10T212122XXXXSSS+=-; NssXX2=1)(22--=∑NXXsX;1)(2--=∑NXXsXpairsDpairsDDNSNSDS2==tXXSXX=--1212tXSX=-μDSDtμ-=NzzrYX∑=; XXSXXz-=XYSSrb=; XbYa-=; bXaY+=ˆ∑-=2)(GitotXXSSSStot=SSb+SSw 2)(AiwXXSS-=∑2)(GAgbXXNSS-=∑MS =SS/df; Dftot= dfw+dfb; dft = N-1; dfw= N-k; dfb= k-1AWNMSqHSDα=WBobtMSMSF=1

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Exam 4 Spring 2007Section 11. A numerical summary of a population of people is called a(n)a.Correlationb.Experimentc.Parameterd.Statistic2. A distribution is a collection of data about an attribute of interest. Such an attribute is called a __________ in research.3. Descriptive and inferential statistics are both computed on a sample of data. The difference is that descriptive statistics concern only the ______, but inferential statistics also concern the ____________.4. Statisticians are concerned both with study design and data analysis. Design refers to _____, and analysis refers to ________.5. Consider the following formula: 1)(22--=∑NXXsX. In the formula, what is the label or name for 2Xs?a.Estimated population variance b.Null hypothesis c.Population standard deviation d.Standard error of the mean

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